My main battery is a Everstart 845 crank 29. It is 4 years old and it is showing signs of getting old. My trolling battery is a Interstate 27 getting close to 6 years old.
1. Should I get another Everstart for main?
2. Thinking about going for two trolling batteries since I am going to do more long-linning this year. One battery this year was just enough for my long-linning but it was near the end of charge. Should I go for two?
3. If I go two for long-linning what battery chargers do you recommend and do I have to charge those two separately? I currently have an old Century battery charger that works ok but was designed for car battery applications. What Deep cycle chargers do you recommend?
4. I guess 3 to 4 years on a main battery is ok.
5. My Interstate almost lasted 6 years.

Thanks all for your help.